BHP Group Limited — Capital/Financing Update 2012

Sep 27, 2012

28 September 2012

Macmahon awarded a $200m contract mining contract extension

Macmahon Holdings Ltd (ASX: MAH) has been awarded a $200 million extension to its Olympic Dam contract in South Australia with BHP Billiton.

As Macmahon’s cornerstone Underground project, the Underground Development Services contract extends the long-term business relationship with BHP Billiton in South Australia which commenced in 2004.

The new three year extension will see Macmahon continue its current activities across the site, which is the largest underground mine in Australia. Macmahon’s contract includes underground development works, the installation of ground support including shotcreting and cablebolting, and load and haul operations. Further, the three year contract includes an option of a one year extension.

Macmahon Chief Executive Officer Ross Carroll said the contract signified the strength of Macmahon’s Underground operations.

“This is our sixth contract extension and a reflection of the quality of service we deliver for all of our clients,” Mr Carroll said.

“The contract underpins Macmahon’s Underground business for the coming period and highlights the range of capabilities we are continuing to deliver across the sector.”

Macmahon has previously invested in the people and plant required to ensure the success of the Olympic Dam contract and this extension enables Macmahon’s site workforce of 210 people to continue to deliver strong results for both the Company and the client.

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For further information, please contact: Investors Tracy Lynch General Manager Investor Relations +61 467 795 335 Media Stuart McLagan Group Communications Manager +61 458 755 117

About Macmahon

Macmahon is a leading Australian contract mining and construction company with major projects throughout Australia, in New Zealand, Asia, Mongolia and Africa.

An ASX/S&P 200 company, Macmahon has played a major role in the delivery of many of Australia’s largest multi-disciplinary mining and construction projects throughout its 49 year history.

Directly employing more than 4500 people, Macmahon offers the full range of underground and surface mining services and comprehensive construction capabilities spanning transport, marine, water and resource infrastructure services.

With a commitment to providing end to end services, Macmahon’s reputation for outstanding teamwork, integrity and commitment to the environment is underpinned by the company’s core value - safety.

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Visit www.macmahon.com.au for more information.

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